@PhDThesis{Gonçalves:2018:TrPeFo,
author = "Gon{\c{c}}alves, Liana Dias",
title = "Trajet{\'o}rias perturbadas por for{\c{c}}as de origem
gravitacional e n{\~a}o gravitacional aplicadas a um
sat{\'e}lite artificial na vizinhan{\c{c}}a de Marte, Fobos e
Deimos",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2018",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2018-03-28",
keywords = "din{\^a}mica orbital, perturba{\c{c}}{\~o}es, sat{\'e}lites
artificiais, sat{\'e}lites naturais, campo gravitacional n{\~a}o
central, harm{\^o}nicos esf{\'e}ricos, orbital dynamics,
perturbations, artificial satellites, natural satellites,
non-central gravitational field, spherical harmonics.",
abstract = "O sistema composto por Marte, Fobos e Deimos possui algumas
caracter{\'{\i}}sticas particulares que comp{\~o}em um
interessante objetivo de estudo: Fobos e Deimos possuem
{\'o}rbitas pr{\'o}ximas a Marte cujos raios orbitais s{\~a}o
de aproximadamente 9000 km e 23000 km, respectivamente, al{\'e}m
de um formato irregular. Sendo assim, uma miss{\~a}o visando
orbitar um dos sat{\'e}lites naturais de Marte, seja para um
r{\'a}pido sobrevoo, ou objetivando pouso na superf{\'{\i}}cie,
est{\'a} sujeita a uma intensa perturba{\c{c}}{\~a}o orbital
devido {\`a} atra{\c{c}}{\~a}o gravitacional de Marte, o que
dificulta de forma significativa manter o sat{\'e}lite em uma
{\'o}rbita est{\'a}vel ao redor das luas por um longo
per{\'{\i}}odo de tempo. Al{\'e}m disso, o formato n{\~a}o
esf{\'e}rico das luas faz com que seu campo gravitacional
n{\~a}o seja central. Levando em considera{\c{c}}{\~a}o as
dificuldades citadas, o presente trabalho busca encontrar casos
onde seja poss{\'{\i}}vel manter o sat{\'e}lite pr{\'o}ximo
{\`a}s luas pelo m{\'a}ximo tempo poss{\'{\i}}vel. Para esse
estudo foi considerada a perturba{\c{c}}{\~a}o devido ao
potencial gravitacional de Marte, considerando a expans{\~a}o dos
harm{\^o}nicos esf{\'e}ricos at{\'e} grau e ordem 80 e um
modelo poliedral para distribui{\c{c}}{\~a}o de massa de Fobos,
al{\'e}m da atra{\c{c}}{\~a}o gravitacional do Sol e de Deimos
para o caso do sat{\'e}lite na vizinhan{\c{c}}a de Fobos, e de
Fobos para o caso do sat{\'e}lite na vizinhan{\c{c}}a de Deimos.
Tal estudo pretende contribuir com a busca por trajet{\'o}rias
minimamente perturbadas na vizinhan{\c{c}}a de Fobos e Deimos,
bem como estudar como manobrar o ve{\'{\i}}culo de modo a
aproxim{\'a}-lo da superf{\'{\i}}cie da lua, quesitos
significativamente importantes tanto para o sobrevoo quanto para o
pouso. ABSTRACT: The moons system of Mars, composed by Phobos and
Deimos, has some special features which represent an interesting
study objective: Phobos and Deimos have orbits near to Mars whose
orbital radius are approximately 9000 km and 23000 km
respectively, in addition these bodies are characterized by
irregular shapes. Thus, a mission aiming to orbit one of the
natural satellites of Mars, whether for a rapid overflight or
landing on the surface, is subject to intense orbital disturbance
due to the Mars gravitational attraction, which makes it
significantly difficult to maintain the artificial satellite in a
stable orbit around the moons for a long period of time. Besides,
the non-spherical shape of the moons makes their gravitational
field not central. Taking into account the difficulties mentioned,
the present work seeks to find cases where it is possible to keep
the satellite near to the moons for the maximum possible time. For
this study was considered the perturbation due to the
gravitational potential of Mars, considering the expansion of the
spherical harmonics up to degree and order 80 and a polyhedral
model for the mass distribution of Phobos, and also the
gravitational attraction of the Sun and Deimos for the case of the
satellite in the Phobos vicinity, and Phobos for the case of the
satellite in the Deimos vicinity. Therefore this study intends to
contribute to the search for trajectories in the Phobos and Deimos
vicinity, as well as to study how to maneuver the vehicle so as to
bring it closer to the surface of the moon, which are
significantly important knowledge for missions that aim to
overflight and landing.",
committee = "Pilchowski, Hans-Ulrich (presidente) and Rocco, Evandro Marconi
(orientador) and Moraes, Rodolpho Vilhena de (orientador) and
Costa Filho, Aguinaldo Cardozo da and Silva, William Reis",
englishtitle = "Trajectories disturbed by gravitational and non-gravitational
forces applied to an artificial satellite in the vicinity of Mars,
Fobos and Deimos",
language = "pt",
pages = "197",
ibi = "8JMKD3MGP3W34R/3QTLK85",
url = "http://urlib.net/ibi/8JMKD3MGP3W34R/3QTLK85",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}